What is wifi calling or VoWIFI

Wifi Calling is also called VoWifi. Wifi network is very common these days.  Wifi network provides the access to internet over wireless channel.  Wifi router is the device, which have antenna for wireless network coverage. Wifi calling uses this radio interface to make and receive calls in normal way as device is attached on GSM network. A wifi network improves the coverage  for a mobile operator, if operator supports wifi calling.  There might be chances that you are carrying a mobile phone in a building basement ,  that phone may lose the radio network. But if wifi calling supported , then phone will switch to wifi network seamlessly. You can avail call services, even if no cellular network is present.

The internet packets tunnels to the mobile operator's network. This enables the mobile operator to control the services for you mobile.

Wifi Calling and Voip: 

Voip or Voice Over IP, looks similar to the wifi calling. But these are two different things. In voip call, additional application needs to install e.g Skype. The identity of contact is different from phone number. The back-end network of internet provider is used. In voip , there will be no interaction with the core network of mobile operator.

Wifi calling, do not need any additional application in phone.  Phone authenticates itself with the core network as it is doing on normal cellular network.

Benefits of Wifi Calling :

Provides more coverage for a mobile operator.

Wifi can be used in places where the strength of cellular network is week or no network.

Fix line operator can also start mobile services without buying cellular network.

No need to install any additional application to make or receive calls over wifi network.

Phone contacts remains same as they used for normal call over gsm network.

Quality of call over wifi is generally good, as most of the places installs very high speed broadband connections and good quality wifi routes.

Most of the smart phones supports the wifi calling. No additional device is required.

Offloads the mobile operator's carrier traffic.

All calls are routed from mobile operator's network. This secure the communication as to third party server involves.

Enable Wifi Calling

The wifi calling feature by default is not active. Mobile user has to enable feature manually. Most of the smart phones have setting available for wifi calling.  At the same time the mobile network operator should also support the wifi calling.

Enable wifi calling iphone:

When it comes to the smart phones. IPhone is considered to be good one. It has all advance options , wifi calling is one of them . To enable this feature, subscriber has to to do following.

  1. Click on settings icon.
  2. Click on phone.
  3. Enable the the wifi calling by from slider.
  4. Give the warning , tap on enable.

Enable Wifif Calling on Andriod :

These days andriod is a very common platform for mobile devices.  Many phone manufactures have adopted the android as os for them. The steps may varies for each phone vendors or model from same phone vendor.  I am using s8. Following are the steps.

  1. Click on settings,
  2. Click on connections, then wifi calling.
  3. Use slider to turn on the feature.

Mobile network for wifi calling or VoWifi:

The mobile network keeps evolving. Which results in more services and more productive experience to a mobile subscriber.  The latest mobile generation is 4G or LTE.  Wifi calling is possible with the LTE network only.  LTE's core network called EPC.  It can connect a non 3GPP network to the mobile core network. The IMS is the additional component which is needed to wifi calling and VoLTE.

The question comes that how a wifi network, signalling converts to the LTE-EPC  network? This is possible via a gateway ePDG or evolved packet data gateway.  This connects public internet to the LTE network. A secure ip based communication takes place between wifi network and ePDG.

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